feat: Backend REST API Grundstruktur

🔐 Auth Routes:
- POST /register, /login, /refresh, /logout
- GET /me

👥 Contacts Routes:
- CRUD + /activities, /deals
- /import, /export (DSGVO Art. 20)

💰 Deals Routes:
- CRUD + /pipeline (Kanban View)
- /move, /won, /lost
- /forecast

📝 Activities Routes:
- CRUD + /upcoming
- /complete

📊 Pipelines Routes:
- CRUD + /stages

✨ Features:
- CORS Middleware
- Error Handler
- Request Logger
- API Documentation Endpoint

src/routes/pipelines.ts

@@ -0,0 +1,109 @@
+import { Router } from "@oak/oak";
+
+const router = new Router({ prefix: "/api/v1/pipelines" });
+
+// GET /api/v1/pipelines - List pipelines
+router.get("/", async (ctx) => {
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "pipeline-1",
+        name: "Sales Pipeline",
+        isDefault: true,
+        stages: [
+          { id: "lead", name: "Lead", order: 1, probability: 10 },
+          { id: "qualified", name: "Qualifiziert", order: 2, probability: 25 },
+          { id: "proposal", name: "Angebot", order: 3, probability: 50 },
+          { id: "negotiation", name: "Verhandlung", order: 4, probability: 75 },
+          { id: "closed_won", name: "Gewonnen", order: 5, probability: 100 },
+          { id: "closed_lost", name: "Verloren", order: 6, probability: 0 },
+        ],
+        dealsCount: 15,
+        totalValue: 250000,
+      },
+    ],
+  };
+});
+
+// GET /api/v1/pipelines/:id
+router.get("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      id,
+      name: "Sales Pipeline",
+      isDefault: true,
+      stages: [
+        { id: "lead", name: "Lead", order: 1, probability: 10 },
+        { id: "qualified", name: "Qualifiziert", order: 2, probability: 25 },
+        { id: "proposal", name: "Angebot", order: 3, probability: 50 },
+        { id: "negotiation", name: "Verhandlung", order: 4, probability: 75 },
+        { id: "closed_won", name: "Gewonnen", order: 5, probability: 100 },
+        { id: "closed_lost", name: "Verloren", order: 6, probability: 0 },
+      ],
+    },
+  };
+});
+
+// POST /api/v1/pipelines - Create pipeline
+router.post("/", async (ctx) => {
+  const body = await ctx.request.body.json();
+
+  ctx.response.status = 201;
+  ctx.response.body = {
+    success: true,
+    message: "Pipeline created",
+    data: {
+      id: "new-pipeline-uuid",
+      ...body,
+    },
+  };
+});
+
+// PUT /api/v1/pipelines/:id - Update pipeline
+router.put("/:id", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+
+  ctx.response.body = {
+    success: true,
+    message: "Pipeline updated",
+    data: {
+      id,
+      ...body,
+    },
+  };
+});
+
+// PUT /api/v1/pipelines/:id/stages - Update stages (reorder, add, remove)
+router.put("/:id/stages", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+  const { stages } = body;
+
+  ctx.response.body = {
+    success: true,
+    message: "Stages updated",
+    data: {
+      id,
+      stages,
+    },
+  };
+});
+
+// DELETE /api/v1/pipelines/:id
+router.delete("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  // TODO: Check if pipeline has deals
+
+  ctx.response.body = {
+    success: true,
+    message: "Pipeline deleted",
+  };
+});
+
+export { router as pipelinesRouter };